Remember to let the narrative of the scenario guide your rolls. Since players already have dice it’s just a matter of rolling them, much like they would during a combat encounter.
The advantage of going this route is that you don’t have to break out cards and slow things down. Even roulette can be recreated using a die roll to represent the ball spinning around the wheel. If your players want their characters to gamble in casino-style games I encourage DMs to steer them towards games that involved rolling dice, like craps or sic bo.
Instead I’ve often found the build up and circumstances of the gambling is a more rewarding gaming experience than actually spending time on the gambling itself. What usually happens is that you end up going player vs. I’ve learned that it’s tough to role-play gambling in D&D.
